| Stephen Amell | Oliver Queen /
Elseworlds Flash |
| David Ramsey | John Diggle |
| Emily Bett Rickards | Felicity Smoak |
| Echo Kellum | Curtis Holt |
| Rick Gonzalez | Rene Ramirez
(credit only) |
| Juliana Harkavy | Dinah Drake
(credit only) |
| Colton Haynes | Roy Harper /
Arsenal
(credit only) |
| Kirk Acevedo | Ricardo Diaz |
| Sea Shimooka | Emiko Queen /
Green Arrow
(credit only) |
| Katie Cassidy | Laurel Lance
(credit only) |
| Grant Gustin | Barry Allen /
Elseworlds Green Arrow |
| Danielle Panabaker | Caitlin Snow /
Killer Frost |
| Carlos Valdes | Cisco Ramon |
| Tyler Hoechlin | Clark Kent /
Elseworlds Superman |
| Melissa Benoist | Kara Danvers /
Supergirl |
| Jeremy Davies | Dr. John Deegan |
| Ruby Rose | Kate Kane /
Batwoman |
| LaMonica Garrett | Mar Novu /
The Monitor |
| Bob Frazer | Roger Hayden /
Psycho-Pirate |
| Cassandra Jean Amell | Nora Fries |
| Liam Hall | Kane Wolfman |
| John Wesley Shipp | Earth-90 Barry Allen /
The Flash |
| John Barrowman | Malcolm Merlyn |
| Tom Cavanagh | Eobard Thawne /
Reverse-Flash |
| Violet Rain | GCPD Officer #2
(as Violet Cameron) |
| Mick Major | Orderly |
| London Morrison | Nurse
(as London A. Morrison) |
| Matthew W. Allen | Homeless Man
(uncredited) |
| Daniel Bernhardt | Goon
(uncredited) |
| Craig Fraser | Arkham Inmate
(uncredited) |
| Debi Wollitzer | Pedestrian /
Driver
(uncredited) |